. OPERATION DETAILED CONTROLS AND GAUGES Engine Oil Level Monitor 3 - 9 Monit or (2) warn s the operator tha t the oi l lev el in the engine oil pan has d ropped. If oil level in the chec k the oil lev el, and ad Maintenance Interval Moni Monit or (3 ) light s up to w that the pass ed since ma intenanc e was la st performed. This monitor scr een goes out afte r 30 seconds and returns to the norm al operation screen. Fo r details of t he metho d of che cking the maintenance interval, e "Maintena nce Switc h (PAG E 3-22)" i n the Detailed controls d gauges. If desired to nterval your Komatsu di stributor c hange t he interva l settings. ime has